William allchin



idtrd WILLIAM ALLCH'IN, or NEWBURG, NEW YORK.

Latas Paten: Nq. 95,551, dated caoba 5, 1869.

sTovE-DRUM. I'

The Schedule referred to in these Letters Patent and making part of thesame. v

To .all whom it may concern Be it known that I, VrLLIAM ALLCHIN, ofNewburg, in the county of Orange, and State of New York, have inventedanew and useful Improvement in Hot- Air Drums or Super-heaters, of whichthe following is afull, clear, and exact description, reference beinghad to the accompanying drawing, forming part of this specification, andin which- 4Figure l represents a vertical longitudinal section of ahot-air drum or superheater constructed in accordance with myimprovement;

Figure '2, a horizontal section of the same, taken as indicated bytheline x x in iig. 1; and

Figure 3, a vertical section 'through the line z z.

Figure 4 is a View, in perspective, of'k a portion or section of thepipe or tubular-passage through which the smoke or escaping products ofcombustion pass in their way through the drum.

Similar letters oi' reference indicate corresponding parts.

This' improvement relates to apparatus which may either be used forVentilating o r superheating-purposes, for heating air by the productsot' combustion as the same escapes from a stove, furnace, oven, range,or other like structure.

The improvement is similar, so far as regards its general principle ofaction, to the hot-air drum described in Letters Patent, No. 85,554, ofthe United States, issued tome January 5, 1869, and in which a drum offlattened construction is used, fitted internally, so as to form threetortuous or zigzag channels np through it, and theinner one of whichserves to conduct the escaping products of combustion, while the twoouter ones are ipassages for air, which, entering the drum,- in a coldor comparativly cool state, at or near its bottom, becomes heated by theplate or partitions vwithin or between which ,the smoke and escapingproducts of combustion4 are passed, and made to circulate or flow inlike directions to and simultaneously with the passage of the air to beheated on the exterior of opposite sides of such smoke-flue or passage.

This invention, however, differs from'such previous improvement in anovel construction of the interior smoke-pipe or line, by making it ofelbows of a dat oval form, fitted together as ordinary stovepipe isfitted, and closely arranging the same within a-drum or case ofa'atteued character, but that may have rounded ends, and which isprovded or fitted with horizontal partitions that serve, in concert withthe elbows, to direct the air to be heated.

Referring to the accompanying drawing- A represents the interiorsmoke-flue of the drum, which may connect at its bottom, in any propermanner, With a stove, furnace, ov'en, range, or other like structure,for carrying oii.' the escaping products of combustion therefrom to thesmoke-stack or outlet.

This smoke-flue A is made lip ofa series of elbows, a a c, of aflattened oval form, tted together as stove-pipes are usually joined orfitted, and forming a continuons crooked-or zigzag pipe, running upthrough an outer sheet-iron or other met-al case, B, and extendingacross the latter, so that the sides of said case touch the. narrowersides ofthe elbows.

The outer case B, which in its general contour is of a flat shape, maybe made up ot' side, end and top plates, suitable 'secured or heldtogether,l or its body may b e composed of sheet-metal, bent to therequired forni, and so as to give toits ends a rounded character, andtheone or both of said ends fitted with orconstructed to forni a lid ordoor, C, while the lower edge of the body is made to tit witlii-n abase, D, of open or flange-like construction, and its top covered by acap, E, having escape-opening oigoutletsb. b and c, for the heated airand smoke.

I Arranged toproject from the ends .of the case B to a`suitable distanceWithin the crooks or bends ot' the' smoke-fine A, so as to form, inconnection with the elany suitable manuel'.

supposing the structure to be arranged so that the smoke-tine A connectsat its bottom with the smoke# pipe or outlet ot' a stove, while the baseD is open to a wall in air-space surrounding said stove, which is thearrangement it is generally designed to adopt, then the drum acts as asuper-heater, the partially heated air passing from said space in atortuous or zigzag man ner up the passages F F, through the drum, onboth or opposite sides of the elbows, while the escaping pro'- ducts ofcombustion make a similar travel up the tlnr. A, causing the airescaping' at the loutlets b b to be superheated. v

The sides of the case B should t close up against the narrower edgesofthe elbows a t c, so that no air will pass.by them directly throughthe case to the outlets, but all air admitted below be forced to travelalong the passages F F. f

The construction ofthe smoke-fine A, as described, by making it ofelbows, not only atords increased facility for putting the structuretogether, but in giving to said elbows an elliptical shape, whichsecures to the drum a more proportionate appearance,and reduces .itsheight, a wide and iiat surface or enlarged area is given to thesmoke-flue, for heatingr o r snperheating the airin the passages F Fwithout imparting or losing heat through the outer case by directexposure ofthe products ot' combustion to contact with the sides of' thecase.

To clean outA the smoke-due A, 'whether made ot' oval or other shape inits transverse section, I provide the sides of the elbows a a a, at theend or ends of the horizontal courses of the smoke-Hue, and facing thedoor in the end of the case, with Scrapers H H, which may be made byriveting a piece of sheet-metal, e, on to a short piece of iron tube, j,arranged to project through an aperture in the elbow from the inside,and having an outside and inside thread cut upon it, so that when notrequredto use the device as a scraper it forms a plug, to 'revgnt theegress of smoke or gas, and may be secur d by a nut, g, made to screw onto the outside of the tube j, while, when it is required to work thedevice as a scraper, a rod, 7i, may be connected with thetube byscrewingrit into the inner thread thereof so that on slacking the nut g,and allowing it to XVM. ALLCHIN.

